Transmission multiplication mechanism



A. ROSSI TRANSMISSION MULTIPLIGATIO IBGHANISI I Filed Sept. 15, 1928 2 Shasta-Shoot 2 \n a no .dnhm'o Rosa Patented Feb. 19, 1929.

bfii'o mess on mmvmsn; mama TRANSMISSION marigrirmemon "mnennmsm Application: fil ed sep tember The pier-lent iuventionn'elates to a gearing mechanism for the transmission 0 t'power andis concerned more particularly with. a complex system of planetary gearingwhich adaptable to a variety of purposes but-which has been. designed primarily for operating. large power plant electricity genera-tors;

It is a-n'object of my inventionto provide transmission mechanism: of the character indicated which shall. be quite durable and relatively efficient. V

More particularly, itis anobject of my invent-ion ;toprovide a transmission mechanism of the planetary rality of independent prairie-movers may be employedin such a manner as to combine their efforts and apply the combined effort to the pai'ticu'larwork for which the mechanismmay be employed. I x

Further,objects and advantages of my invention will appear in connectionwit-h the following description together with the ad eompa-nying drawings.

In the drawings,

Fig. 1 is a view of: my improvedtransmission inend elevation, s

Fig. 2 is a top plan view of. the device shown in Figure 1. but illustrating a'ditferent relation of the parts, I

Fig; 3 is a view in end elevation.illustrating a modified form of my invention,

Fig. 4 is a sectional view on line 4 4: of Figure 8.

Referring to Figuresl and 2"of the drawings, the reference numeral 1 designates a suitably mounted frame which forms asup port for my transmission mechanisnn The frame is of open rectangular fo'rnr and is preferably mounted in a substantially horizontal position. A Sl'lftfi; 2 extends trans versely of the frame substantiallyiuidway of the length thereof and is non-rotatably mounted upon the side frame members as indicater at 3 and .1-. This shaft 2 and the frame 1 are relativel\- lined and my improved system of planetary gearing is revolul lly supported by the shaft for movement withinthe confines of the frame.

Journaled upon shaft in spaced relation are a pair of arins 5 and 6, the latter of which is secured for rotation'in unison witha large gear 7, which is also journaled on: shaft 2, by meansof' suitableconnecting members indicated at 8. The adjacent or corresponding ends of arms 5 and 6 are connected by transversely extending shaft-s 8 and 9 whereby the type whereina plu armsare caused to rotate in unison.- 'l heends of shafts 8 andilare of: irregular contour-and are secured in=correspondingly formed aper tures-inthe ends of the arms, whereby the shafts are held innon rotatable relation with reference tothe'arms. Secured to shaft 2 adjacent the arnrfiis a central or sungear 10 and in meshing engagement there.v -ith is a- .pair ofgplanet gears 11 and: 12 which are retatablymounted onshafts 8* and. 9"respectiyely. Thus,. arms 5 and Sand connecting. shafts 8 and 9 are-adapted to revolve about the fiXedshaftI-2 withplanet gears 11 and 12 in running meshwith the stationary sun-gear 1O. This mechanism may therefore be termed a planetary gearing. unit, which for COIN/611161106 may be regarded. as the primary un t of the system. The means by WlHOlIthIS primary unit is drivenwill now be described: 7

Each planet pinion. ofthepriniary unit. is ad apted-to'be driven by a: secondaryplanetany' unit. The secondary unitsare identical and each comprises a pair'ofspaced: arms 13 and 14; rotatably mountedupon shafts8 andQ, oneofthe said arms 14 being-rotatably coupledto each of the planet gears 11 and-12 of'the-primaryunitt Corresponding endsof arms 13' and 14 are connectedby shafts 15 and 16- whichare non-rotatably secured in saidarms in-the maner described in connection with the shafts of, the primary unit. Planet gears 17 and 18 are rotatably supported on shafts 15' and 16 and these gears are adapted'to' mesh% with fixed sun" gears 19'secured to the nou rotatable shafts 8 and'9: Thus, the ar1ns'13 andlet, shafts 15 andv 16, planet gears 17 and 18 and sun gear 19 constitute secondary plan etary units, the carrier elements of which serve to drive'the planet pinions of' the primary unit;

The-planet gears of the secondary units arein turn actuated by tertiary units whercin'tlie power for the entire system originates. There are-four of these tertiary units, one associated with each ofthe four planet gears ot-the secondary units. Each tertiaryunit comprises a pair of, spaced arms 20-and 21 journaled upolr theiplanet shafts of the secondary units and having the ar1ns21 rotati-vely secured to the corresponding-planet gears of saidsecendaryunits. The adjacent ends of arms 20:and- 21 are likewise provided with shafts 22 and. 23 nonrotatively associated therewith. Each of these fixed shafts has secured thereto the armature of an electric motor, the fields 24 whereof are rotatable about the fixed shafts and armatures. The rotatable field of each motor is provided with a planet pinion 25 which engages with a non rotatable sun gear 26 secured to the corresponding planet gear shaft of the secondary units.

' The operation of this novel transmission system will now be described. Energization of the several electric motors causes the several field elements and associated gears to retate and by reason of t 1e engagement of the gears of each tertiary unit with. rehf fixed sun gears, the motors and coni'iected gears together with the carrier frame by which they are supported, are caused to revolve about the axes of the said sun gears. Thus, it is apparent that the motive power of the system originates in the several tertiary units. in the particular construction shown there are four tertiary units, two secondary units and a single primary unit. The tertiary units are associated in pairs with the two secondary units, the carrier frames of said tert'ary units being drivingly connected with the planet gears of the secondary units. The carrier frames of thesecondar y units are in turn drivingly connected vith the planet gears of the primary unit. The movement of the carrier frame of the primary unit may be utilized. in any desired manner and by way of example the frame is herein illustrates as being directly secured to a gear which drives a generator.

It will be appreciated that the several driving motors may be siiipplied with current in any desired manner and I have therefore deemed it unneccsary to illustrate any particular circular arrangement. In accordance with my invention, it is contemplated that in the use of my device the driving motors may be energized simultaneously or successively as desired.

It should be appreciated that my invention is not limited to the employn'ient of any particular set of ratios, this oeing a matter of choice to be governed by the work to be performed. Obviously, the acompa-nying drawlngs are not intenued to depict any particular gear ratio. Either a reduction or step-up in speed may e accomplished by the selection of appropriate gear ratios.

In .l igurcs 3 and l l have illustrated a slightly modified form of planetary unit which may be employed in lieu of the tertiary units of Figures 1 and 2,. in this form the motor shafts are rotatably supported in carrier frame while the lield structlu are secured against rotation by means of cross bars 27 and suitable securing means passing theret-hrough and into engagement with the motor casings. Each motor shaft carries a pinion 28 and for each unitthere is a relatively fixed sun gear interposed between the pinions 28 and sun gear 29 is a train of reduction gearing comprising gears 30, 31 and In the arrangement shown, these gears effect a substantial reduction in speed but it should be appreciated that any desired speed change may be produced by proper gear ratios.

What I claim is: V

1. In a transn'iission system, the combination with a primary planetary unit consisting of a relatively fixed sun gear, cooperating planet gears and a carrier whercon said planet gears are n'iounted, of a secondary unitof substantially similar character revolubly supported by the carrier of the said primary unit and drivingly connected with the aforesaid planet gears of the primary unit-and a tertiary unit revolubly supported by the carrier of the said secondary unit and having driving connection with the planet gears of said secondary unit and a prime mover associated with one of the elements of said tertiary. unit.

2. In a transmission system, a non-rotatable shaft,'a sun gear fixed thereon, planet carrier revolubly supported on said shaft, a planet shaft non-rotatably secured in said carrier, a planet gear rotatably mounted on said planet shaft and having meshing engagement with said fixed sun gear and means for driving said planet gear comprising another planetary unit of like charaete the carrier whereof is revolubly supported on th aforesaid planet shaft and has driving connection with the aforesaid planet gear, a sun gear fixed to the aforesaid planet shaft, a planet gear rotatably supported by the carrier of the last mentioned unit and meshing with the lastmentioned sun ear and motor mounted on the carrier and drivingly connected with the last mentioned planet gear.

3. A. planetary system comprising primary, secondary and tertiary planetary units, each of said units con'iprising a rela tively fixed sun gear, a planet carrier, planet shafts non-rotatably secured in said carrier and planet gears rotatably supported on s: i'd shafts, the carriers of said secondary and tertiary units being revolubly mounted on the planet shafts of said primary and secondary units respectively the sun gears of said secondary and tort 1'}? units being secured to the planet slmfis'o'i said primary and secondary units rcspcctir". id st ,the carrier of oiulary and tertiary un ts being drivingly,

coiuieilod with the planet gears of said primary and secondary units respectively and prime movers supported by the carri rs of said tertiary units and drivingly connected with theplanet thereof. 7

in testimony whereof I have affixed. my signature this 10th day of August-.1928.

anronio aossi. 

